block: push down BKL into .locked_ioctl

As a preparation for the removal of the big kernel
lock in the block layer, this removes the BKL
from the common ioctl handling code, moving it
into every single driver still using it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 1d0c4b7c3b69..633ac32b25c1 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -46,6 +46,7 @@
 #include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/delay.h>
+#include <linux/smp_lock.h>
 #include <linux/mutex.h>
 #include <linux/string_helpers.h>
 #include <linux/async.h>
@@ -924,6 +925,7 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
         SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
                                                 disk->disk_name, cmd));
 
+        lock_kernel();
         /*
          * If we are in the middle of error recovery, don't let anyone
          * else try and use this device.  Also, if error recovery fails, it
@@ -933,7 +935,7 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
         error = scsi_nonblockable_ioctl(sdp, cmd, p,
                                         (mode & FMODE_NDELAY) != 0);
         if (!scsi_block_when_processing_errors(sdp) || !error)
-                return error;
+                goto out;
 
         /*
          * Send SCSI addressing ioctls directly to mid level, send other
@@ -943,13 +945,18 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
         switch (cmd) {
                 case SCSI_IOCTL_GET_IDLUN:
                 case SCSI_IOCTL_GET_BUS_NUMBER:
-                        return scsi_ioctl(sdp, cmd, p);
+                        error = scsi_ioctl(sdp, cmd, p);
+                        break;
                 default:
                         error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
                         if (error != -ENOTTY)
-                                return error;
+                                break;
+                        error = scsi_ioctl(sdp, cmd, p);
+                        break;
         }
-        return scsi_ioctl(sdp, cmd, p);
+out:
+        unlock_kernel();
+        return error;
 }
 
 static void set_media_not_present(struct scsi_disk *sdkp)
@@ -1123,7 +1130,7 @@ static const struct block_device_operations sd_fops = {
         .owner                  = THIS_MODULE,
         .open                   = sd_open,
         .release                = sd_release,
-        .locked_ioctl           = sd_ioctl,
+        .ioctl                  = sd_ioctl,
         .getgeo                 = sd_getgeo,
 #ifdef CONFIG_COMPAT
         .compat_ioctl           = sd_compat_ioctl,